Allclean script in ThirdParty (v1606+) wrongly deletes all installed ThirdParty packages instead of the out-of-source temporary build files
The following part of the Allclean script in the ThirdParty folder of v1606+ wrongly deletes all the installed ThirdParty packages instead of deleting only the out-of-source build files:
# clean out-of-source build directories [ -d platforms ] && ( set -x; rm -rf platforms/* )
# clean out-of-source build directories [ -d build ] && ( set -x; rm -rf build/* )
in order to clean only the out-of -source build files, but leave the installed packages intact.